Thermostatic valve control



June 23, 1936.

c. D. Bo| |N- TH-ERMOSTATIC VALVE CONTROL 2 Sheets-Sheet 2 Filed, July 19, 1934 f//s i Ar rae/vens Patented .lune 23, A1936 UNITED STATES PATENT] OFFICE '2,045,289 l TnEnMos'rArxo vALvE con'raor.

Charles D. Bohm-St. Louis, Mo., assignor to American Thermometer Company, St. Louis, n Mo. ay corporation of Missouri f Applicaties July 19, 1934. serial No. 736,020

. claims. (onzas-99) My invention relates-to*tlierniostatsl of the type actuated by an expansiveiiidlf 'eI-.tiis espe- E by the expansive iiuid and that has a long lii'e.

Other objects and advantages will appearhere'- inafter.

The present invention may be said to be an improvement, as to the thermostatic control device and the compensating device therefor, over the invention set forth in my co-pending application Serial No. 696,757. The present invention embodies many of the features seti'orth in said copending application and includes all of the advantages` of said invention, as well as havins important additional advantages of its own.

The invention consists in the thermostatic valve control and in the parts and combinations and arrangements of parts hereinafter described and claimed. K

In the accompanying drawings, which form part of this spec'lilcation, and wherein like numerf als refer to like parts wherever they occur,

Fig. 1 is a sectional view'of a thermostat for a, gas oven embodying my invention; f

Fig. 2 isqa'sectional view on the line2-2 in Fig. 1;

Fig. 3 is a fragmentary sectionalview on an sleeve 4 thathas a closed end 5 and an annular ilange 6 partly overlapping ythe end wallof said yiront housing section I, and the rear housing sec-- tion 3 is threaded onto said ange Sand abuts against the end oi the front housing section I. A pipe 1 leads from the gas'maniiold (not shown) into the inlet chamber of said housing on one side of said valve 2; and a pipe 3 leads from the outlet chamber oi said housing on the other side of said valve 2, to the oven burner (not shown).

The operating knob 3 and a graduated indicating dial I0 showing temperatures from room temperature to thel maximum cooking temperature, are secured on the projecting end oi a rotary vmounted a pin 28 on the end of valve operating stem I I, which has a conical portion I 2. seated in a taperedportion I 3 of the front valve housing section I. The knob 3 is shown v as of hollow cup shape and having the dial I0 secured to its back face by means of screws I4. 5 Itis xed `on the valve operating stem II` and a cover I5` therefor having a central screw I6 thaty is threaded into the end of said stem II securesA v said knob in place on the stem. A collar I1 is interposed between said knob 9 and the end of 10 the front' housing section I.

The valve operating stem II has a project tongue I I a that fits in a slot or recess I3 vformed in the enlarged end portion of a pin I9 that slidand said pin I9 urges said pin away from said stem and tends to lift said valve 2 off its seat 20. 20

Said pin I9 has a threaded'ndportion 22 that extends into an interiorly threaded sleeve or nut 23 that has an annular ange 24 disposed in the front housing section. Said nut 23 and flange 24 are held against rotation bymeans of pins 25 25 I that project from said housing sleeve into the flange 24 of said nut 23. A helical spring 26 is interposed between the valve 2 and said iiange i 24. The nut 23 has an axially projecting hollow plunger 21 that extends through a hole in the 30 closed end 5 of said sleeve 4 at the end of the iront housing section. In said plunger 21 is hich is a sup'- porting plate 23 that has a periph al shouldered flange 30 in which is mounted a static metal 3l, securing lugs 2 holding said thermostatic metal 3l in place. A contact button 33 having a rounded head-portion is secured to said thermostatic disk as by riveting.

An axially bored stud 34 has a threaded reduced 40 portion 35 that extends through an opening '33 in the end wall 31 of said rear housing section. A nut 38 on said stud permits it to be drawn up tight against the housing wall 31. Extending into saidl stud 34 is the'end oi' a tube 33 whose 45 other end extends into a'metal container 40 that is mounted in the oven or other chamber to be heated and that contains the expansive iluid.v

Mounted in the rear housing section 3 are Pairs of nested con-ligated disks 4I having iiat 50 middle portions 42. The disk'4Ia at one end of the series has its flat middle portion l42 secured,l as. by welding, to said stud 34, the disk 4Ib at the other end of the series has its iiat middle portion 42 in engagement with the contact b ut-'f 55' sk of thermo- 35 ton Il on said thermostatic compensating disk 3l; and the middle disks llc have their middle portions I2 welded together. Said disks Il all have peripheral ilanges I3, the ilanges of the disks of a pair being nested and the nested ilanges -of the two pairs extend in opposite directions, that is, the unilanged faces of the middle disks llc oppose each other. The anges 43 of .each pair of disks are secured throughout their periphery by welding.

The endmost disk lla that is secured to said stud 34 and the middle disks llc have central openings 44 therethrough that communicate with the bore of said stud 34. Normally the two disks of a pair are in close contact with each other over their entire surfaces, thecorrugations 45 of the disks 4| nesting closely together. When an increase in oven temperatures causes an expansion of the iiuid in the container 40 and the tube ll, this iluid forces apart the two disks Il of said button, thus moving the valve operating mechanism into position to close the valve 2. Upon a decrease in temperature, the disks of each pair move back into contact with each other, expelling the liquid therefrom back into the stud and tube and permitting the valve 2 to open again.

'Ihe valve housing I, 3 is commonly placed on a portion of the stove some distance from the oven but adjacent to a burner. Thus, the lighting of said burner will increase the temperature in the housing and hause an expansion oi' the iluid. This action would prevent the device from being solely responsive to the oven temperature. Accordingly, the thermostatic disk 3| is arranged to compensate for any movement of the thermostatic disks 4| that is responsive to the temperature in the vicinity of the housing.

The above described control disks and compensating control disk are of simple and durable construction and they are quite sensitive in operation. Only slight movement of the corrugated disks is required. The closure in the' front housing section l keeps gas from entering the rear housing section 3 -that contains the thermostatic devices. Obviously, numerous changes (particularly in the valve operating devices) may be made without departing from the invention and I do not wish to be limited to the precise construction shown.

What I claim is:

l. A thermostatic' device comprising two pairs of nested corrugated iiexible disks, the disks of each pair having overlapping peripheral ilanges welded together, the middle disks abutting at their middles and being -welded together, an axially bored stud welded to the middle portion of one of said disks, said disk and said middle disks having central perforations, and a supply of heat responsive iluid, whereby the disks of each pair are normally in contact with each bother but are separated when heat 'forces said fluid into the spaces between disks.

2. A thermostatic device comprising two paus of nested con'ugated iiexible disks, the disks of acuoso said middle disks having central perforations, and a supply of heat responsive fluid, whereby the disks of each pair are normally in contact with each other but' are separated when heat forces said iiuid intothe spaces between disks.

3. A thermostatic device comprising two pairs of nested corrugated ilexible disks of stainless steel, the disks of each pair having overlapping peripheral ilanges welded together, the middle disks abutting at their middles and being welded together, an axially bored stud of stainless steel welded to the middle portion of one of said disks, said disk and said middle disks having central perforations, and a supply of heat responsive iluid, whereby the disks of each pair 'are normally in contact with each other but are separated when heat forces said fluid into the spaces between disks.

. 4. A thermostatic device comprising two pairs of nested corrugated flexible disks of stainless steel, the disks of each pair being of equal thickness and having overlapping peripheral flanges welded together, the pairs of disks being arranged with the unilanged faces of the middle 'disks opposing each other and abutting at their middles, said abutting portions being welded to'- gether, an axially bored stud welded to the middle portion of one of said disks, said disk and. said middle disks having central perforations, and a supply of heat responsive fluid, whereby the disks of each pair are normally in contact with each other but are separated when heat 'forces said fluid into' the spaces between disks.

5. A thermostatic .device comprising two pairs of nested corrugated disks, the disks of each pair having overlapping peripheral iianges Welded together, the pairs oi' disks being arranged with the unflanged faces of themiddle disks opposing each other and abutting at their middles, said abutting portions being welded together, an axially bored stud welded to the middle portion of one of said disks, said disk and said middle disks having central perforations, a supply of heat responsive iluid, whereby the disks of each pair are normally in contact with each other but are separated when heat forces said fluid into the spaces between disks, a compensating thermostatic disk adjacent to the disk remote from said stud and a contact member on said compensating disk freely engaging said thermostatic disk.

6. A thermostatic control device comprisinga housing having a front section provided with inlet and outlet chambers, a valve for controlling communication between said chambers, a sleeve threaded in 'the end of said front section and having a closed end and a peripheral threaded ilange overlapping said front housing section, said housing also having a rear section screwed on said flange, a plunger operatively connected with said valve and extending through a hole provided therefor in said sleeve end, a thermostatic metal plate carried by said plunger, a member adjacent to said thermostatic member and movable by the heat of a remote chamber, and

a member on said thermostatic metal plate, freesaid chambers, a plunger operatively connected with said valve, a thermostatic metal plate carried by said plunger, two pairs of nested corrugated disks, the disks of each pair having overlappingfperipheral anges welded together, the

pairs oi' disks being arranged with the unflanged faces of the middle disks opposing. each other and abutting at their middle, said abutting disks being welded together, an axially vbored stud welded to the middle portion oi one of said disks, said disk and said middle disks having central perforations, va supply oi' heat responsive huid, whereby the disks of each pair are normally in contact with each other but are separated when heat forces said fluid into the spaces between disks, and a member on said thermostatic metal plateireely engaging one of said corrugated disks. l

8. A thermostatic control device`.comprising a housing having a front section provided with inlet and outlet chambers and a rear section, a valve for controlling communication between said chambers, a plunger operativelyconnected with said valve, a thermostatic metal plate carried by said plunger, two pairs of nested corrugated disks, the disks or each pair having overlapping peripheral ilanges welded together, the pairs of disks'being arranged with the unilanged faces or the middle disks opposing each other andabut ting at their middle, said abutting disks being welded together, an axially bored stud welded to the middle portion oi one oi said disks, said disk and said middle-disks having central perdisks. said lrear housing section having an opening through its end and said stud having a reduced threaded portion projecting through said opening and a nut on said stud for drawing it tight against the end of said housing section. 10

9. A device of the kind described comprising pairs of nes'ted `corrugated ilexible disks, the disks of each pair having overlapping peripheral flanges welded together and disks of adjacent pairs abutting against each other and being se- 15 cured together at their middles.

10. In a thermostatic device, a pair of nested corrugated iiexible disks having overlapping pe" ripheral flanges welded together, an axially bored stud welded to the middle portion oi one ot said' 20 disks, said disk having a. central opening communicating with the bore oi' lsaid stud, and a supply of heat responsive iluid for the bore of said stud, whereby said disks are normallyin s contact with each other over their entire sur- 25 face butare separated when heat forces said' iiuidinto the-spaces between said disks. Y

. CHARLES D. BOLlN. 

